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| author | Roopa Prabhu <roopa@cumulusnetworks.com> | 2020-04-27 13:56:46 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-04-28 12:50:37 -0700 |
| commit | 4f80116d3df3b23ee4b83ea8557629e1799bc230 (patch) | |
| tree | 7673a5205ba4759de3f9735e30cf3edd096e36e5 /Documentation/networking/ip-sysctl.txt | |
| parent | 11dd74b338bf83f8bca70b57bad33a903fedfa6e (diff) | |
| download | lwn-4f80116d3df3b23ee4b83ea8557629e1799bc230.tar.gz lwn-4f80116d3df3b23ee4b83ea8557629e1799bc230.zip | |
net: ipv4: add sysctl for nexthop api compatibility mode
Current route nexthop API maintains user space compatibility
with old route API by default. Dumps and netlink notifications
support both new and old API format. In systems which have
moved to the new API, this compatibility mode cancels some
of the performance benefits provided by the new nexthop API.
This patch adds new sysctl nexthop_compat_mode which is on
by default but provides the ability to turn off compatibility
mode allowing systems to run entirely with the new routing
API. Old route API behaviour and support is not modified by this
sysctl.
Uses a single sysctl to cover both ipv4 and ipv6 following
other sysctls. Covers dumps and delete notifications as
suggested by David Ahern.
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking/ip-sysctl.txt')
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index 9375324aa8e1..5cdc37c34830 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -1560,6 +1560,18 @@ skip_notify_on_dev_down - BOOLEAN on userspace caches to track link events and evict routes. Default: false (generate message) +nexthop_compat_mode - BOOLEAN + New nexthop API provides a means for managing nexthops independent of + prefixes. Backwards compatibilty with old route format is enabled by + default which means route dumps and notifications contain the new + nexthop attribute but also the full, expanded nexthop definition. + Further, updates or deletes of a nexthop configuration generate route + notifications for each fib entry using the nexthop. Once a system + understands the new API, this sysctl can be disabled to achieve full + performance benefits of the new API by disabling the nexthop expansion + and extraneous notifications. + Default: true (backward compat mode) + IPv6 Fragmentation: ip6frag_high_thresh - INTEGER |